What is " Tsunami " ??
Why it is caused ??
Answers
Answer:
A tsunami is a series of huge waves caused by the shifting of large amounts of ocean water. An underwater earthquake is the most common cause of a tsunami. Tsunamis are also caused by volcanic eruptions and underwater landslides
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Answer:
What is a tsunami?
Tsunami (pron: 'soo-nar-me') is a Japanese word: 'tsu' meaning harbour and 'nami' meaning wave. Tsunami are waves caused by sudden movement of the ocean surface due to earthquakes, landslides on the sea floor, land slumping into the ocean, large volcanic eruptions or meteorite impact in the ocean.
Until recently, tsunami were called tidal waves, but this term is generally discouraged because tsunami generation has nothing to do with tides (which are driven by the gravity of the Earth, Moon and Sun). Although some tsunami may appear like a rapidly rising or falling tide at the coast, in other situations they can also feature one or more turbulent breaking waves.What causes tsunami?
Earthquakes
Most tsunami are caused by large earthquakes on the sea floor when slabs of rock move past each other suddenly, causing the overlying water to move. The resulting waves move away from the source of the earthquake event.Landslides
Landslides can happen on the seafloor, just like on land. Areas of the seafloor that are steep and loaded with sediment, such as the edge of the continental slope, are more prone to undersea landslides.
When an undersea landslide occurs (perhaps after a nearby earthquake) a large mass of sand, mud and gravel can move down the slope. This movement will draw the water down and may cause a tsunami that will travel across the ocean.Volcanic eruptions
Tsunami initiated by volcanic eruptions are less common. They occur in several ways:
destructive collapse of coastal, island and underwater volcanoes which result in massive landslides
pyroclastic flows, which are dense mixtures of hot blocks, pumice, ash and gas, plunging down volcanic slopes into the ocean and pushing water outwards
a caldera volcano collapsing after an eruption causing overlying water to drop suddenly.